Fuse



L. F. YOUNG ayfi, 1947.

FUSE

Filed June 9, 1942 m M Y F U E L I Patented May 6, 1947 UNITED srrs a r o r r: c

2 Claims.

(Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 O. G. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to delayed arming fuses of the type shown in U. S. Patent No. 2,190,374 and represents an improvement thereover. In the said patent the arming blocks rotate with the vanes and develop a centrifugal force, and being engaged with the arming sleeve, such force is transmitted through the sleeve to the gears of the arming mechanism, causing deformation and breaking of the teeth and resulting in failure of the fuse to function.

It is therefore an object of the invention to provide a fuse of the type described in which the effect of centrifugal force exerted by the blocking members on the arming mechanism is minimized.

The specific nature of the invention as well as other objects and advantages thereof will clear- 1y appear from a description of a preferred embodiment as shown in the accompanying drawings in which:

Figure 1 is a top plan view of the fuse, and

Figure 2 is an elevational View in partial axial section taken on the line 2-2 of Figure 1.

Referring to the drawing by characters of reference there is shown a fuse body I and threaded therein a sleeve 2 forming a bearing seat for the rotary member 3 rotating on ball bearings 4 and carrying vanes 5 secured by a nut 6. A sleeve 1 threaded to the member 3 and interlocked with the sleeve 2 as at 8 to retain the rotary member 3, carries a gear 9 meshing with a pinion Ill. Another gear II of a difierent number of teeth from the gear 9 also meshes with the pinion II) and carries an arming sleeve I2 which Is threaded into the sleeve I. The action of the gear and pinions is thus to move the arming sleeve I2 with respect to the sleeve 1.

The blocks I3 are sector-shaped and truncated arcuately as at I4 to fit the outer periphery of arming sleeve I2. A slot I5 in the outer periphery of each block serves to receive a pin I6 carried by the nut 6.

In this form of fuse, the blocks I2 when freed escape after swivelling about retaining pins I6. Nearly all of the pressure due to the centrifugal force of the blocks is borne by the pins I6 since the blocks are radially aligned. However, the equilibrium of the blocks is unstable, and hence, after withdrawal of the arming sleeve I2 they will tend to swing about the pins I6. Since, at most, but a very small component of the centrifugal force is carried to the arming sleeve I2, the gearing is not affected by such forces as in the known fuses.

I claim:

1. In a fuse having a headed firing pin, a wind vane and an arming sleeve axially displaceable by rotation of said vane through the intermediation of a differential gearing, safety blocks under the head of said pin, surrounding and entirely without said sleeve and pins carried by said vane and each contacting the outer periphery of one of said blocks in a recess therein, said blocks being of such size and spacing as to be removable around the said pins without interference on and only on displacement of the sleeve, the center of gravity of said blocks lying substantially on a line between the pin and the sleeve axis.

2. In a fuse, a firing pin, a wind vane assemblage rotatably mounted on the nose of the fuse safety blocks mounted on said Wind vane assemblage for rotation therewith and positioned to restrain said pin, outer restraining means for said blocks and displaceable inner tubular restraining means for said blocks, said outer restraining means being of small size relative to the block so as to permit escape of said blocks on removal of said inner restraining means, the center of gravity of said blocks lying substantially on a line between the outer means and the axis of the fuse, and means associated with the wind vane assemblage for removal of said inner restraining means.

LEO F. YOUNG.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,190,374 Bold Feb. 13,1940 1,569,248 Adelman Jan. 12, 1926 1,380,774 Clay June 7, 1921 2,092,687 Yancey Sept. 7,1937

FOREIGN PATENTS Number Country Date 798,334 Fr. Mar. 2, 1936 

